[1D01-07] Surface Science / Structure (SS3)

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)

[1D04] 3D Structure and Thermal Stability of Single-Atom Pt Alloys Studied by Polarization-dependent Total Reflection Fluorescence XAFS

*Tetta Takeuchi¹, Bang Lu², Daiki Kido^3,4, Satoru Takakusagi², Kotaro Takeyasu² (1. Graduate School of Environmental Science, Hokkaido University (Japan), 2. Hokkaido Univerisity, Institute for catalysis (Japan), 3. Institute of Materials Structure Science, High Energy Accelerator Research Organization, KEK (Japan), 4. The Graduate University for Advanced Studies, SOKENDAI (Japan))

Single-atom alloy catalysts have attracted significant attention due to their resource efficiency and unique reaction characteristics; however, their three-dimensional structures have not yet been experimentally elucidated. In this study, aimed at determining the 3D structure of Pt single atoms formed on a Cu(111) surface, we performed polarization-dependent total reflection fluorescence (PTRF)-XAFS measurements at the Pt LIII-edge and simulations using the FEFF code. As a result, we found that the Pt single atom is structurally stabilized by shifting 0.10 Å upward from the substitutional Cu surface site.

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